A light bulb manufacturer guarantees that the mean life of a certain type of light bulb is at least 730 hours. A random

[answerhappygod]

A Light Bulb Manufacturer Guarantees That The Mean Life Of A Certain Type Of Light Bulb Is At Least 730 Hours A Random 1 (64.54 KiB) Viewed 21 times

A light bulb manufacturer guarantees that the mean life of a certain type of light bulb is at least 730 hours. A random sample of 28 light bulbs has a mean life of 702 hours. Assume the population is normally distributed and the population standard deviation is 55 hours. At a = 0.02, do you have enough evidence to reject the manufacturer's claim? Complete parts (a) through (e) (a) Identify the null hypothesis and alternative hypothesis. O A. Ho:p*730(claim) Hau=730 OD. Ho: 5702 Hu> 702 (claim) O B. Ho: >730 Haus 730 claim) O E. Ho: <702 (claim) H: 12702 0C. HỌ: H=702 HA:702 (claim) OF. Ho: 12730 (claim) H, μ<730 (b) Identify the critical value(s). Use technology Zo = (Use a comma to separate answers as needed. Round to two decimal places as needed.) Identify the rejection region(s). Choose the correct answer below. OA. OB O c. Fail to reject Ho Fail to reject Ho Fail to reject Ho a Q a A Reject Ho/ Reject Ho Reject Ho The Reject Ho 0 (c) Identify the standardized test statistic. Use technology. z ZE (Round to two decimal places as needed.) (d) Decide whether to reject or fail to reject the null hypothesis, and (e) interpret the decision in the context of the original claim. O A. Fail to reject Ho. There is not sufficient evidence to reject the claim that mean bulb life is at least 730 hours. OC. Fail to reject Ho. There is sufficient evidence to reject the claim that mean bulb life is at least 730 hours. OB. Reject Ho. There is sufficient evidence to reject the claim that mean bulb life is at least 730 hours. OD. Reject Ho. There is not sufficient evidence to reject the claim that mean bulb life is at least 730 hours.